Calibration is a controlled product conditionKeep a repeatable line-of-sight baseline, device calibration record and separately characterized installed orientations and non-line-of-sight conditions.Calibration is a controlled product conditionA single offset cannot repair every multipath or angular error.GeometrySame board + feed + housingCalibrationDevice-specific delay methodOrientationAngles + polarization + bodyEnvironmentLOS baseline + NLOS trials³Ô¹Ïtv engineering illustration · conceptual, not to scale · no measured product data